Ruby

merge revision(s) 0b8f15575a440f85ac686f5b0eae8f8b7c2b72e7: [Backport #19836]

 Fix memory leak for incomplete lambdas [Bug #19836] The parser does not free the chain of `struct vtable`, which causes memory leaks. The following script reproduces this issue: ``` 10.times do 100_000.times do Ripper.parse("-> {") end puts `ps -o rss= -p #{$$}` end ``` --- parse.y | 24 ++++++++++++++---------- test/ripper/test_ripper.rb | 7 +++++++ 2 files changed, 21 insertions(+), 10 deletions(-)